Controlling-valve for pressure-gages.



I J. DESMOND. GONTROLLING VALVE FOR PRESSURE GAGES. APPLICATION FILED AUG. 19, 1912.

1 Patented July 7, 1914;

- most violent, be required; to stop UNITED ,STATES PATENT onnron;

' WORN DES'MOND, OF WILMETTIB, ILLINOIS,' ASSIGNOR TO WILLIAM S. POTWI'N, OF

. CHICAGO, ILLINOIS.

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Specification of Letters Patent;

Patented July 7, 1914.

Application filed August 19, 1912. Serial No. 715,744.

To all whom it, may concern Be it known that I, JoHN' DESMOND, a citizen of the United States, residing at Wilmette, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in. Controlling-Valves for Pressure-Gages, of which the following is a specification.

My invention relate s to a controlling valve for pressure ages and has for its general object to provi e an attachment by the use of which increased accuracy may be attained in the reading of a pressure gage of ordinary construction.

One of the environments in which my invention is particularly applicable is in conjunction with tire-inflatmg apparatus, es-, pecially where the air-compressor is-power driven. In such apparatus, the gage is cus tomarily included in the piping between the air-compressing pump and the tire to,

be inflated, and when so applied its needle does. not indicate any definite pressure but:

vibrates back and forth in response to direct and, counter impulses of air within the piping and. tire, so that no definite indication is madeby. the gage of the actual pressure ex isting at any given time withinl the tire during the operation of the pump, When the importance of exactness in tire inflation is considered the advantage of my valve will be appreciated, especially with power-driven pumps where the tire may easily be overinflated, for when such pumps are used the distracting vibration of the gage needle is and itis most troublesome to the pump at intervals to allow the gage needle to settle.

My invention contemplates, therefore, the provision of a controlhn valve of simple construction easily inserti 1e with the ordinary gage in. the piping between the pump and tire and so constructed that by a single movement of a manually moved part the ga eneedle will immediately become stable an settle to indicate the exact pressure within the tire without necessity of stop- P ng t p mp- Inthe drawing, illustrating an embodiment of. my invention, Figure 1 is an elevation showing the a plication of the valve structure in'the piping between a tire and;

vertical central section through the device, with the gage (in elevation) carried thereby. In said drawing, A indicates a tire tobe inflated, between which and an. air-compressing pump B, the piping is connected in usual fashion, such iping being in two sections, C and C, or connection therebetween of my device. The piston rod hot the pump, of course, may haveassociated therew th the usual pump-operating means (not shown). I

My device, the essential and novel features of which will become apparent to those slxilled in the art from the following description of one advantageous embodiment thereof and from the appended claims, includes amain structure of generally cruciform shape, one arm 5 of which has a screwthreaded bore for supporting. engagement of the gage D, the oppositefarm 6 of which has a threaded bore for receipt of a valve-car- .rying part 7 to be hereafter specifically described, and. the ther two arms 8 and 9 of which are centra llyebored as at 10 and 11 and extenorly rib d as at 12 and 13 for engagement of the piping sections C and O. The bore of arm 6 is extended inwardly, past a polnt of communication with the bore 10 as at 14, and terminates in a tapering valve seat15, the center of which communicates through a port 16 with the bore arm 5 heretofore mentioned. Between said bore in arm 5 and the bore 11 in arm 9, extends a duct 17. Thus, it will be seen, that there is provided by the structure described independent passageways from the ga e respectively to the pump and to the tire, t e passageway to the pump in-v cludmg a port with which is associated a .valve seat, and that when said port is open,

as shown in Fig. 2, communication may be had from the pump both to the gage and to the tire.

an air-compressing pump; and Fig. 2 is a The valve-carrying member 7, secured in I the threaded bore of arm 6 as heretofore descr1b ed, comprises the exteriorly threaded portion 18 and the head 19, so that said until the head 19 contacts with the end of member 7 may be screwed into the arm 6 the upper end of said bore I provide a flaring valve seat 21. The lower end of said bore also flares outwardly to accommodate the handle of a valve member to be described. 7

It will now be seen that the space 23, formed by the extended bore of arm 6, has at its ends opposing valve seats 15 and 21 and in its side a communication 1410 with the pump. Within said space 23 I provide a valve member 24 having at its ends tapering portions 25 and 26 corresponding with the valve seats 15 and 21, so that in uppermost position said valve member closes the port 16 and in lowermost normal osition 1t closes the bore 20 which would ot erwise be open to the exterior atmosphere.

As a guide and to provide a manually operable means for moving said valve member 24, I provide a stem 27, a portion where-v of is squared as at 28 for guiding engagement in the bore without obstructing the passage. of air therethrough, and atthe end of said stem I provide a push button 29, so shaped and arranged on the stem that it does not meet the flaring portion 22 of the arm 6 when it is pushed as far inwardly as the abutment of the tapering end 25 of the valve against the seat 15 will permit, and communication is therefore afforded from-the pump past valve portion 26 and seat 21, if not closed, around the stem 2Z '-'28, and between the push button 29 and flaring portion 22 of arm 6,for escape to the exterior. It will be understood that this passage is opened at 26-21 when the duct 16 is closed at'1525.

In the use of my device, assuming it to T be applied as shown in Fig. 1 the pump B started in operation, and valve member 24 seated at 21, as shown in the figure, by the influence of gravity, and held more firmly seated by the increased pressure thereabove due to operation of the pump, air will be pumped into the tire by passag; B, C, 10, 14, 23, 16, 17, 11, C, the gage communicating with said passage and therefore operating in. usual fashion, that is, vibrating back and forth continuously, the vibrations being in some degree depen ent upon the relative force of the pump and rapidity of its strokes, but in no event remaining stationary toindicate any particular pressure which may be takenas that existing within the tire at any particular mo ment. Now if it is desired to ascertain the exact pressure attained in the tire, all that is necessary is to push button 29 inwardly to close duct 16, and open bore 20 as above explained when the gage, communicating with the quiescent air within' the tire through passage 17, 11, C, will become stationary in a position which will indicate the exact pressure within the tire at the time.

In the meantime the pump need not be stopped since the c osing of duct 16 at 15 25 opens the bore 20 at 26-21 for escape of the air which is pumped into the space 23. Thereading having been made, the finger may be removed from the button 29 when the pressure within duct 16, together with the influence of gravity, will cause it to fall again to the position shown in Fig. 2, with bore 20 closed for further inflation of the tire by the continuously operating pump.

It will be observed that the device is such that the gage operates in usual fashion when the button is in lowermost position, so that the pressure conditions in the tire may be generally watched by observation of such ordinary operation of the gage, and when the vibrations of the needle indicate'that the pressure may be nearing the desired pressure to be attained, the button may be operated to ascertain the exact pressure. Thus, absolute precision in the reading may be attained with an ordinary gage when applied in the piping in cooperation with therein without departing from the spirit of the invention and within the scope of the claims.

What I claimis:

1. A controllin valve for pressure gages to be interposed etween a compressor and air receiver, comprising a casing, having an interior chamber, formed with a valve seat at each end thereof; a movable valve member, within the chamber adapted to seat on either one of the two valve seats; aduct, leading from the said chambei and adapted to communicate with the air compressor; a duct, leading from the center of each of the valve seats; a valve stem, extendingthrough one of the last mentioned ducts, and'having a cross sectional area less than that of the duct, the other duct communicating with a recess in the casing; a pressure indicating device connected to the said recess and .a

, duct, adapted to communicate with the. air

receiver and extending into the recess to which the pressure indicating device is connected.

2. A controlling valve for pressure gages to be interposed between a compressor and air receiver, comprising a casing having an interior chamber formed with a conical valve seat at each end thereof; a movable valvemember cone shaped at each end, Within the chamber adapted to seat on either one of the two valve seats; a duct, leading from the said chamber and adapted to communicate with the air compressor, a duct,

leading from the center of each of the valve seats; a longitudinally ribbed valve stem, extendingthrough one of the last mentioned ducts and having a cross sectional area less than that of the duct, the other duct communicating with a recess in the casing; a pressure indicating device connected to the said recess and a. duct, adapted to communicate with the air receiver and extending into In testimony whereof I hereunto set my hand in the presence of two witnesses.

JOHN DESMOND.

In the, presence of- Fonr'in BAIN, MARY F. ALLEN. 

